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Reinsurance - Credit Quality Information (Details) - USD ($) $ in Millions	Mar. 31, 2025	Dec. 31, 2024	Mar. 31, 2024	Dec. 31, 2023
Reinsurance Recoverable, Credit Quality Indicator [Line Items]
Reinsurance Recoverables, Gross	$ 7,260	$ 7,215
Reinsurance Recoverable, Allowance for Credit Loss	(75)	(75)	$ (101)
Net Reinsurance Recoverables	7,185	7,140
Mandatory and Voluntary Risk Pools [Member]
Reinsurance Recoverable, Credit Quality Indicator [Line Items]
Reinsurance Recoverables, Gross	208	205
Captives [Member]
Reinsurance Recoverable, Credit Quality Indicator [Line Items]
Reinsurance Recoverables, Gross	419	402
Other not rated companies [Member]
Reinsurance Recoverable, Credit Quality Indicator [Line Items]
Reinsurance Recoverables, Gross	201	181
AMBestRated [Member]
Reinsurance Recoverable, Credit Quality Indicator [Line Items]
Reinsurance Recoverables, Gross	6,432	6,427
AM Best, A++ Rating [Member]
Reinsurance Recoverable, Credit Quality Indicator [Line Items]
Reinsurance Recoverables, Gross	2,250	2,271
AM Best, A+ Rating [Member]
Reinsurance Recoverable, Credit Quality Indicator [Line Items]
Reinsurance Recoverables, Gross	2,694	2,674
AM Best, A Rating [Member]
Reinsurance Recoverable, Credit Quality Indicator [Line Items]
Reinsurance Recoverables, Gross	839	830
AM Best, A- Rating [Member]
Reinsurance Recoverable, Credit Quality Indicator [Line Items]
Reinsurance Recoverables, Gross	623	626
AM Best, B++ Rating [Member]
Reinsurance Recoverable, Credit Quality Indicator [Line Items]
Reinsurance Recoverables, Gross	4	4
AM Best, Below B plus plus Rating [Member]
Reinsurance Recoverable, Credit Quality Indicator [Line Items]
Reinsurance Recoverables, Gross	22	22
Operating Segments [Member] | Property, Liability and Casualty Insurance Product Line
Reinsurance Recoverable, Credit Quality Indicator [Line Items]
Reinsurance Recoverables, Gross	6,741	6,698
Reinsurance Recoverable, Allowance for Credit Loss	(72)	(72)	(98)	$ (100)
Net Reinsurance Recoverables	6,669	6,626
Operating Segments [Member] | Property, Liability and Casualty Insurance Product Line | Mandatory and Voluntary Risk Pools [Member]
Reinsurance Recoverable, Credit Quality Indicator [Line Items]
Reinsurance Recoverables, Gross	208	205
Operating Segments [Member] | Property, Liability and Casualty Insurance Product Line | Captives [Member]
Reinsurance Recoverable, Credit Quality Indicator [Line Items]
Reinsurance Recoverables, Gross	419	402
Operating Segments [Member] | Property, Liability and Casualty Insurance Product Line | Other not rated companies [Member]
Reinsurance Recoverable, Credit Quality Indicator [Line Items]
Reinsurance Recoverables, Gross	195	176
Operating Segments [Member] | Property, Liability and Casualty Insurance Product Line | Reinsurance Contract [Axis]: Before Disputed Amounts [Member]
Reinsurance Recoverable, Credit Quality Indicator [Line Items]
Reinsurance Recoverable, Allowance for Credit Loss	(20)	(24)	(44)	(43)
Operating Segments [Member] | Property, Liability and Casualty Insurance Product Line | Reinsurance Contract [Axis]: Disputes [Member]
Reinsurance Recoverable, Credit Quality Indicator [Line Items]
Reinsurance Recoverable, Allowance for Credit Loss	(52)	(48)	(54)	$ (57)
Operating Segments [Member] | Property, Liability and Casualty Insurance Product Line | AMBestRated [Member]
Reinsurance Recoverable, Credit Quality Indicator [Line Items]
Reinsurance Recoverables, Gross	5,919	5,915
Operating Segments [Member] | Group Insurance Policy [Member]
Reinsurance Recoverable, Credit Quality Indicator [Line Items]
Reinsurance Recoverables, Gross	297	291
Reinsurance Recoverable, Allowance for Credit Loss	(1)	(1)	(1)
Net Reinsurance Recoverables	296	290
Operating Segments [Member] | Group Insurance Policy [Member] | Mandatory and Voluntary Risk Pools [Member]
Reinsurance Recoverable, Credit Quality Indicator [Line Items]
Reinsurance Recoverables, Gross	0	0
Operating Segments [Member] | Group Insurance Policy [Member] | Captives [Member]
Reinsurance Recoverable, Credit Quality Indicator [Line Items]
Reinsurance Recoverables, Gross	0	0
Operating Segments [Member] | Group Insurance Policy [Member] | Other not rated companies [Member]
Reinsurance Recoverable, Credit Quality Indicator [Line Items]
Reinsurance Recoverables, Gross	6	5
Operating Segments [Member] | Group Insurance Policy [Member] | AMBestRated [Member]
Reinsurance Recoverable, Credit Quality Indicator [Line Items]
Reinsurance Recoverables, Gross	291	286
Operating Segments [Member] | AM Best, A++ Rating [Member] | Property, Liability and Casualty Insurance Product Line
Reinsurance Recoverable, Credit Quality Indicator [Line Items]
Reinsurance Recoverables, Gross	2,250	2,271
Operating Segments [Member] | AM Best, A++ Rating [Member] | Group Insurance Policy [Member]
Reinsurance Recoverable, Credit Quality Indicator [Line Items]
Reinsurance Recoverables, Gross	0	0
Operating Segments [Member] | AM Best, A+ Rating [Member] | Property, Liability and Casualty Insurance Product Line
Reinsurance Recoverable, Credit Quality Indicator [Line Items]
Reinsurance Recoverables, Gross	2,188	2,169
Operating Segments [Member] | AM Best, A+ Rating [Member] | Group Insurance Policy [Member]
Reinsurance Recoverable, Credit Quality Indicator [Line Items]
Reinsurance Recoverables, Gross	286	281
Operating Segments [Member] | AM Best, A Rating [Member] | Property, Liability and Casualty Insurance Product Line
Reinsurance Recoverable, Credit Quality Indicator [Line Items]
Reinsurance Recoverables, Gross	838	829
Operating Segments [Member] | AM Best, A Rating [Member] | Group Insurance Policy [Member]
Reinsurance Recoverable, Credit Quality Indicator [Line Items]
Reinsurance Recoverables, Gross	1	1
Operating Segments [Member] | AM Best, A- Rating [Member] | Property, Liability and Casualty Insurance Product Line
Reinsurance Recoverable, Credit Quality Indicator [Line Items]
Reinsurance Recoverables, Gross	619	622
Operating Segments [Member] | AM Best, A- Rating [Member] | Group Insurance Policy [Member]
Reinsurance Recoverable, Credit Quality Indicator [Line Items]
Reinsurance Recoverables, Gross	4	4
Operating Segments [Member] | AM Best, B++ Rating [Member] | Property, Liability and Casualty Insurance Product Line
Reinsurance Recoverable, Credit Quality Indicator [Line Items]
Reinsurance Recoverables, Gross	2	2
Operating Segments [Member] | AM Best, B++ Rating [Member] | Group Insurance Policy [Member]
Reinsurance Recoverable, Credit Quality Indicator [Line Items]
Reinsurance Recoverables, Gross	0	0
Operating Segments [Member] | AM Best, Below B plus plus Rating [Member] | Property, Liability and Casualty Insurance Product Line
Reinsurance Recoverable, Credit Quality Indicator [Line Items]
Reinsurance Recoverables, Gross	22	22
Operating Segments [Member] | AM Best, Below B plus plus Rating [Member] | Group Insurance Policy [Member]
Reinsurance Recoverable, Credit Quality Indicator [Line Items]
Reinsurance Recoverables, Gross	0	0
Segment Reporting, Reconciling Item, Corporate Nonsegment [Member]
Reinsurance Recoverable, Credit Quality Indicator [Line Items]
Reinsurance Recoverables, Gross	222	226
Reinsurance Recoverable, Allowance for Credit Loss	(2)	(2)	$ (2)
Net Reinsurance Recoverables	220	224
Segment Reporting, Reconciling Item, Corporate Nonsegment [Member] | Mandatory and Voluntary Risk Pools [Member]
Reinsurance Recoverable, Credit Quality Indicator [Line Items]
Reinsurance Recoverables, Gross	0	0
Segment Reporting, Reconciling Item, Corporate Nonsegment [Member] | Captives [Member]
Reinsurance Recoverable, Credit Quality Indicator [Line Items]
Reinsurance Recoverables, Gross	0	0
Segment Reporting, Reconciling Item, Corporate Nonsegment [Member] | Other not rated companies [Member]
Reinsurance Recoverable, Credit Quality Indicator [Line Items]
Reinsurance Recoverables, Gross	0	0
Segment Reporting, Reconciling Item, Corporate Nonsegment [Member] | AMBestRated [Member]
Reinsurance Recoverable, Credit Quality Indicator [Line Items]
Reinsurance Recoverables, Gross	222	226
Segment Reporting, Reconciling Item, Corporate Nonsegment [Member] | AM Best, A++ Rating [Member]
Reinsurance Recoverable, Credit Quality Indicator [Line Items]
Reinsurance Recoverables, Gross	0	0
Segment Reporting, Reconciling Item, Corporate Nonsegment [Member] | AM Best, A+ Rating [Member]
Reinsurance Recoverable, Credit Quality Indicator [Line Items]
Reinsurance Recoverables, Gross	220	224
Segment Reporting, Reconciling Item, Corporate Nonsegment [Member] | AM Best, A Rating [Member]
Reinsurance Recoverable, Credit Quality Indicator [Line Items]
Reinsurance Recoverables, Gross	0	0
Segment Reporting, Reconciling Item, Corporate Nonsegment [Member] | AM Best, A- Rating [Member]
Reinsurance Recoverable, Credit Quality Indicator [Line Items]
Reinsurance Recoverables, Gross	0	0
Segment Reporting, Reconciling Item, Corporate Nonsegment [Member] | AM Best, B++ Rating [Member]
Reinsurance Recoverable, Credit Quality Indicator [Line Items]
Reinsurance Recoverables, Gross	2	2
Segment Reporting, Reconciling Item, Corporate Nonsegment [Member] | AM Best, Below B plus plus Rating [Member]
Reinsurance Recoverable, Credit Quality Indicator [Line Items]
Reinsurance Recoverables, Gross	$ 0	$ 0

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Amount, after valuation allowance, recoverable under reinsurance contracts including premium paid under reinsurance contracts. Examples include, but are not limited to, settled and unsettled claims, incurred but not reported losses, loss adjustment expense, premium paid, policy benefits and policy reserves.

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Amount of allowance for credit loss on reinsurance recoverable.

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Amount before valuation allowance recoverable under reinsurance contracts. Examples include, but are not limited to, settled and unsettled claims, incurred but not reported losses, loss adjustment expense, premium paid, policy benefits and policy reserves.

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